PC Chips M507 - what's JP4 for?

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Rainbow
The UniFlasher
Posts: 3122
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Wed Sep 25, 2002 7:51 pm

I have 4 PC Chips M507 boards (two dead). They have JP4 jumper which is not documented anywhere. The only thing that's printed on the board is "JP4: IRQ". It's between the ROM and RTC, consists of 5 two-pin jumpers. They were all open on all 4 boards. Using ohm-meter, found out that the upper pins are connected to IRQ lines (5, 14, 10, 14 and 12). I guess that it's IRQ selection for something. But for WHAT :?:
Weird thing: the bottom pins are NOT connected together :!:
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
Rainbow
The UniFlasher
Posts: 3122
Joined: Wed Mar 20, 2002 4:16 pm
Location: Slovakia
Contact:

Wed Sep 25, 2002 9:15 pm

No IRQ selection. Ohm-meter shows that all pins are IRQ lines. Looks like this is not a jumper field but a connector for some kind of diagnostic device.
Pinout:

Code: Select all

All numbers are IRQs

5  14 10 4  12
.  .  .  .  .
.  .  .  .  .
6  7  15 3  11
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
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